Should I Insulate Roof Deck Or Floor In New Construction

See pictures as the deck is close to the ground about a foot on one side and 6 inches on the other looks like the former owner put some sort of tarp on the ground.

Should i insulate roof deck or floor in new construction. Hence the term cold decks construction materials wood based products absorb moisture. We live in eastern pa. But if the floor is covered in plywood you can t stuff enough insulation beneath it to do the job sufficiently not even in warm climates. The higher the r value the better the thermal performance of the insulation.

Insulation requirements by climate zone. The minimum insulation requirements for ceilings walls floors and foundations in new homes as listed in the 2009 2012 2015 and 2018 iecc and irc can be found in this table additional code requirements are listed on the compliance tab of this guide. The roof deck is cold wood decks without insulation above them will readily equilibrate to the exterior temperature. The table below shows what levels of insulation are cost effective for different climates and locations in the home.

In renoing his 100 year old home a friend of mine discovered that the kitchen was originally a porch that had over the years been enclosed. During cooler night times and in winter periods the deck temperature can then be below the dew point of the interior air. And two floors were added above. One side we can crawl under on the other side we will need to take up the deck boards.

However designers of compact roof assemblies must consider vapor permeance and arrangement of the roofing materials to produce acceptable hygrothermal performance and low. We want to insulate the floor which is two different levels. I have 12 by 16 covered deck i would like to close in i need to know the best way to insulate the floor i am installing under floor electric heating my idea was to nail 2by2 strips along the. Unvented roof systems where the insulation and air barrier are applied directly to the underside of the roof deck are common in applications where designers are seeking cost effective and energy efficient roof assemblies.

Insulating a cold floor whether it s a room over an unheated garage a first floor over a crawl space or what was originally a deck is certainly possible. Deck to addition insulating the floor thanks for the replies. With the floor gone you ll have to find a spot elsewhere for stashing those off season clothes and that holiday decor. My other thought was to do just as is described i was planning on attaching furring strips on the side of the pt 2x8s at the bottom and lay in concrete board in the bays caulk around the edges all as a way to keep out possible vermin since we live in the woods.